2. Atoms and the Periodic Table

Write the group number and draw the Lewis symbol for each of the following elements: e. gallium

Write the group number and draw the Lewis symbol for each of the following elements: c. calcium

An unidentified element is found to have an electron configuration by shell of 2 8 18 8 2. To what group and period does this element belong? Is the element a metal or a nonmetal? How many protons does an atom of the element have? What is the name of the element? Write its electron-dot symbol.

Consider the following Lewis symbols for elements X and Y: (6.1, 6.2, 6.5)

c. What ions would be formed by X and Y?

Consider an ion with the symbol X²⁺ formed from a representative element. (6.1, 6.2, 6.3) b. What is the Lewis symbol of the element?

Consider an ion with the symbol Y³⁻ formed from a representative element. (6.1, 6.2, 6.3) b. What is the Lewis symbol of the element?